What sauce did the Japanese customers not prefer at KFC?

Explanation:

Japanese customers at KFC did not prefer Ketchup. Ketchup is not commonly used in traditional Japanese cuisine and may not pair well with the flavors of KFC's menu items. On the other hand, other sauce options like Soy sauce and Teriyaki would be more familiar and complementary to Japanese taste preferences.

The question of what sauce did the Japanese customers not prefer at KFC relates to cultural preferences in food consumption. While sauces such as soy sauce, ketchup, and teriyaki are popular in Japanese cuisine, the sauce associated less with Japanese customers at KFC is gravy. Gravy is a Western-style sauce that typically accompanies meat and mashed potatoes and is not commonly used in traditional Japanese dishes. This preference is influenced by the cultural and culinary differences, where the flavors and textures of gravy might not align with the local palate used to more umami or sweet sauces that are common in Japanese cooking.